J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 1123-1126
Generation and characterization of quasi-monoenergetic electron beams from laser wakefieldA. Maksimchuk, S. Reed, N. Naumova, V. Chvykov, B. Hou, G. Kalintchenko, T. Matsuoka, J. Nees, P. Rousseau, G. Mourou and V. Yanovsky
FOCUS Center and Center for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel blvd., Ann Arbor, Michigan 48109, USA
In the interaction of a 30 fs, 40 TW Ti:sapphire Hercules laser focused to the intensity of 1019 W/cm2 onto a supersonic He gas jet, we observed quasi-monoenergetic electron beams with energy up to 300 MeV and an angular divergence of 10 mrad. We found that the initial plasma density significantly affects the resultant electron beam. For plasma densities ranging between 2 1019 to 3.5 1019 cm - 3, quasi-monoenergetic electrons with energies from 80 to 160 MeV and a total charge of about 0.5 nC were produced. Lower plasma densities around 1.5 1019 cm - 3 produced quasi-monoenergetic electron beams with higher energy, up to 320 50 MeV, but with a decrease of the total charge to about 5 pC. Characterization of the electron beam in terms of the electron's maximum energy, beam divergence and pointing stability is presented. The performed 2D PIC simulations show the evolution of the laser pulse in the plasma, electron injection, and the specifics of electron acceleration.
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